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Re: [AV Media Matters] Pixie Dust
Just wanted to clarify a point made earlier in this thread. Super
Paramagnetic effects are/were "believed" to be limitataions in very high
magnetic
recording densities BUT are not the cause of erasure (data loss) in
magnetic media.
As mentioned, IBM's successful use of Ruthenium has placed the magnetic
recording limit issue on the back-burner.
Ron Weiss
ARkival Technology
In a message dated 6/4/03 11:49:53 AM Eastern Daylight Time,
Jimwheeler@aol.com writes:
<< Hard Disk Drives:
About a year ago, I posted a piece about IBM's use of "Pixie Dust" to
increase the density of HDDs to 400 GB per disk. They did this by
adding Ruthenium
to the magnetic coating. Ruthenium seperates the magnetic particle so
that
they have less affect on each other when tightly packed together. As
Peter
Brothers pointed out, this is called "Super-paramagnetism".
The Center for Magnetic Recording Research at University of
California--San
Diego (CMMR) has done some work on the problem of super-paramagnetism
but they
need funding to continue their research. www.cmrr.ucsd.edu
Jim Wheeler
>>
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